| 宽量程微电流测量系统 |
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| 引用本文： | 周艳明,谢中,王祝盈,王太宏,陈小林,李媛.宽量程微电流测量系统[J].物理实验,2006,26(11):18-20,23. |
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| 作者姓名： | 周艳明 谢中 王祝盈 王太宏 陈小林 李媛 |
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| 作者单位： | 湖南大学,应用物理系,湖南,长沙,410082 |
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| 摘 要： | 宽量程微电流测量系统利用多增益前置放大器与可编程增益数据采集卡组成两级放大,通过PC机控制选择不同增益实现宽量程的测量,并对其噪声进行了仿真分析,提出了提高信噪比的措施.实验表明,该系统能对动态范围10-11~10-4A电流信号进行有效测量.
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| 关 键 词： | 宽量程 微电流放大器 噪声 信噪比 |
| 文章编号： | 1005-4642（2006）11-0018-03 |
| 收稿时间： | 2006-04-29 |
| 修稿时间： | 2006-04-29 |
Wide range weak current integrated amplifier |
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| ZHOU Yan-ming,XIE Zhong,WANG Zhu-ying,WANG Tai-hong,CHEN Xiao-lin,LI Yuan.Wide range weak current integrated amplifier[J].Physics Experimentation,2006,26(11):18-20,23. |
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| Authors: | ZHOU Yan-ming XIE Zhong WANG Zhu-ying WANG Tai-hong CHEN Xiao-lin LI Yuan |
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| Institution: | Applied Physics Department, Hunan University, Changsha 410082, China |
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| Abstract: | The wide range weak current measurement system is a two level amplifier composed of multi-gain preamplifier and programmable data collection card.The wide rang measurement is realized through computer controlled gain selection.The noise characteristic of the preamplifier is analyzed by simulation,and the method of improving signal-to-noise is discussed.The experiment shows that this system can detect weak current effectively with the range from 10~(-11) to 10~(-4) A. |
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| Keywords: | wide rang weak current amplifier noise signal-to-noise ratio |
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